Kibera, Kenya
It is the largest of Nairobi's slums, and the second largest urban slum in Africa, with an estimated population of between 800,000 and 1.2 million inhabitants. Encompassing an area of only 2.5 square kilometres (1.5 square miles), Kibera accounts for less than 1% of Nairobi's total area, but holds more than a quarter of its population, with over 1,250 people crowded into each acre of land. There is more to this story, however--the courage and dignity of the people living there.